Now that he’s a billionaire and all, it’s nothing to Beats By Dre mogul Dr. Dre to leave whatever kind of tip he wants. While out last week partying at the Skybar in West Hollywood’s Mondrian Hotel, the doc left around 2am and dropped a whopping $5,000 on his waitress’ tip! Earlier in the night, he was spotted copping an expensive Mac & Lou bracelet for his wife, Nicole Threatt. Must be nice to be D-R-E!